A non-question has recently preoccupied the literary corners of the Internet: How rude should a book critic be? I call it a non-question because its non-answer is the same as for people in social situations generally: it depends. It’s impossible to find a universal rule that licenses rudeness. There’s always going to be at least one observer who feels that a conflict could and should be handled politely. (And who knows? Insofar as politeness is a skill, maybe there's always room for improvement.) Also, there’s always going to be at least one observer who describes as honest what others call rude. But even if you give up on unanimity and settle for a majority opinion, you still can’t formulate a general decision. Try it and see. Was William Giraldi justified in adopting a rude tone about Alix Ohlin’s novel? Was Ron Powers, about Dale Peck’s? Only the particular questions are worth debating, and no matter how many questions like them you answer, you never reach a rule that has the purity of math. The most you can hope for is etiquette.